Trance music isn't something you'd normally hear at a piano lesson. However, since the idea is to expose students to a wide variety of musical genres, why not?

Wisegeek defines trance music as: "an art form that relies heavily on the use of electronic equipment and a specific tempo range, typically 130-160 beats per minute (BPM), to create a musical arrangement that is understood to have somewhat hypnotic qualities." It came onto the scene in the 1990's.There is a set form to trance music. The repetitive melodies are "connected by a series of crescendos and breakdowns." Sounds a bit like minimalist music in a way.